| distortion of symmetrical introgression in a hybrid zone: evidence for locus-specific selection and uni-directional range expansion. | the fate of species integrity upon natural hybridization depends on the interaction between selection and dispersal. the relative significance of these processes may be studied in the initial phase of contact before selection and gene flow reach equilibrium. here we study a hybrid zone of two salamander species, lyciasalamandra antalyana and lyciasalamandra billae, at the initial phase of hybridization. we quantify the degree and mode of introgression using nuclear and mtdna markers. the hybrid ... | 2006 | 16674567 |